Yep, the physical key can still be used as backup - just as with most cars.
Curious observation: US tech blogs often occasionally feature stories about high-end physical locks being defeated by Biro-lids or paper clips... or how the physical key can be recreated from a photograph of it.
No lock is perfect - I've seen combination locks on doors with what is widely knows as Shiny Button Syndrome, the buttons used to enter the code having become shiny through use. SBS makes it clear to an intruder that they only have to try 16 combinations instead of 1000 (given the code is four digits long)
Biting the hand that feeds IT
